利用重叠加窗方式恢复地面运动

Recovering ground motion by using overlap windowing

在频率域,利用地震记录反卷积恢复地面运动,由于FFT运算导致的谱泄漏与系统传递函数对高频与低频的放大效果会导致地面运动恢复失败,本研究采用重叠加窗方式,可避免单一加窗的时域失真,并减小频域谱泄漏。结果表明,恢复地面运动取得了较好效果。

The recovering of ground motion with the means of seismographic record deconvolution in the frequency domain will failure, because of the spectral leakage in FFT operation and the amplification effect of system transfer function in high and low frequency. In this article, the method of overlap windowing is employed to avoid the signal loss in time-domain caused by single windowing and also avoid the spectral leakage in FFT operation. With this method, the recovering of ground motion gets good results.